\documentclass[a4paper,titlepage]{ctexart}

\usepackage{graphicx}
\usepackage{float}
\usepackage{datetime}
\usepackage{tcolorbox} 
\title{Latex}
\author{wufeng}
\date{\today}

\begin{document}
	\maketitle
	\tableofcontents
	\newpage
	\part{part标题}
	\section{section标题}
	\begin{flushleft}
		Dr.~Smith 发表了研究成果.
	\end{flushleft}
	
	aa
	\subsection{subsection标题}
	\subsubsection{subsubsection标题}
	\paragraph{paragraph标题}
	\subparagraph{subparagraph标题}
	
	\begin{thebibliography}{99}
		\bibitem{1} 参考文献1
		\bibitem{2} 参考文献2
	\end{thebibliography}
	
	
\end{document}
